Communication system



Feb. 10, 1931. DlNGLEY, JR 1,792,417

COMMUNICATION SYSTEM Filed Jan. 26, 1929 2 III F gwuawvhom form/e0 A! Ol/VGLEY Jn Patented Feb. 10, 1931 UNITED STATES EDWARD N. DINGLEY, JR., OF' WASHINGTON, DISTRIC'IOF COLUMBIA COMMUNICATION SYSTEM Application filed January 26, 1929. Serial No. 335,311. r

(GRANTED UNDER manor or MARCH 3, 1883, 118 AMENDED APRIL so, 1925; 370 de. 757) My invention relates broadly to systems for communication by means of radio and more particularly to systems in which high speed telegraphy is utilized as a means for communication: V

The object of my invention-isto produce a system for the remote control and high speed keying of radio apparatus.

Further objects of my invention will appear more fully hereinafter as the description of the method and apparatus is developed.

My invention consists substantially in the construction, combination and arrangement of parts associated therewith or as will be 15 more fully hereinafter set forth as shown by the accompanying drawings and finally pointed out in the appended claims.

Reference is to be had to the accompanying drawing forming a part of this specification in which numeral 1 designates the antenna of a radio transmitter system which is coupled to an oscillator tube 2 by means of a coupling transformer 3, and the usual stopping condenser 1. The plate 5 of the tube 2 is supplied with current from a generator 6 through a radio frequency chokecoil 7. The filament 8 of the vacuum tube 2 is supplied with heating current through the usual transformer and condenser system 9, the

30 center tap 10 of which is maintained at ground potential.

The frequency of the current generatedby the vacuum tube 2 is controlled by a master oscillator tube 11, the filament 12 of which is 35 supplied with heating current through the usual transformer and condenser system 13,

the center tap 14 of which is maintained at ground potential in the usual manner. The

. plate 15 of the tube 11 is supplied with our- 40 rent from the generator 6 through a choke coil 16. Y

The frequency of the current generated by the master oscillator tube 11 is controlled by means of an inductance 17 the center of 45 which is grounded and one end of which is coupled to the grid 18 of the tube 11 by means of a grid condenser and grid leak 19,

and the other end of which is coupled to the plate 15 of the tube 11 through a condenser 0 20. Around the center tapof the coil 17 is a generated by the master oscillator tube-11 variable condenser 21variably connected to the inductance 17 for determining frequency of this system. A V By means of a variable tap 22 variations in potential in the current generated by the master oscillator tube 11 are impressed upon the'grid 23 of the vacuum tube 2 through a condenser 24. Whether or not the current effects the grid 23 is controlled by a modu- 1 lator or keying tube 25.

The filament of the modulator tube 25 is supplied with heating current from a source of power 26, one terminal of which is 15 grounded in the usual manner. The action of the tube 25 is controlled by an automatic orhandkey 29 which impressesa positive or negative potential across a resistance 30 through a safety lamp 31, potential across the resistance 30 being apportioned and im- 0 pressed upon the grid 28 of the tube 25 through the variable tap 32. Between the grounded terminal of the source of power 26 and the source of power for the plate 36 ofthe vacuum tube 25 I have provided a resistance 33, along which there is a variable tap 37 whichis connected to the grid 23 of the tube 2 through a biasing battery 27 and a radio frequency choke'coil 34.

' The operation of my device is as follows: l/Vhen a positive potential is impressed upon the grid 28 by the key 29 current flowing in the plate circuit of the tube 25 causes a negative potential to be impressed upon the grid 23 of the tube 2. This negative potential, to- 5 I gether with the potential of the biasing battery 27, blocks the oscillations of the tube 2. Then a negative potential is impressed upon the grid 28 by the key 29 the tube 25 is blocked so that no current flows through the resistance 33. The potential of the grid 23 then raises to the potential of the biasing battery 27 and the frequency of the output ofthe tube 2 is controlled by the master oscillator 11. 1

It will be seen from the above description that I have developed a keying systemand in which there'is no lag due to mechanical relays.

It will be understood that the above descri tion and accom an in drawin s comprehend onl the general and preferred embodiment 0 my invention and that minor detail changes in the construction and arrangement of parts may be made within the scope of the appended claims without sacrificing any of the advantages of my invention.

The invention described herein may be manufactured and used by or for the Government of the United States for governmental purposes without the payment to me of any royalty thereon.

Having thus described my invention what I claim is -1. In a system for high speed transmission of signals the combination of a power tube, a master oscillator therefor, and means for stopping oscillations of said power tube, said means consisting of a vacuum tube having grid-filament and plate-filament circuits, means for varying the potential across sait grid-filament circuit and means within said plate-filament circuit for impressing a negative bias upon the grid of said power tube when current flows in said plate-filament circuit.

2. In a system for high speed transmission of signals the combination of a power tube, a master oscillator therefor, and means for stopping oscillations of said power tube, said means consisting of a vacuum tube having grid-filament and plate-filament circuits, means for varying the potential across said grid-filament circuit, and means within said plate-filament circuit for impressing a negative bias upon the grid of said power tube when current flows in said plate lilament circuit, said means consisting of a resistance in said plate-filament circuit connected between the source of power for said plate and the filament of said vacuum tube and a variable tap connecting said resistance with the grid of said power tube.

3. In a system for high speed transmission of signals, the combination of a power tube, a master oscillator therefor, and means for stopping the oscillations of said power tube, said means consisting of a vacuum tube having grid-filament and plate-filament circuits, means for va 'ying the potential across said grid-filament circuit, said means consisting 61 a resistance one terminal of which is con nected to the filament of said vacuum tube, means for applying an alternative, positive and negative potential to the other terminal of said resistance, a variable tap connected to said resistance intermediate its ends and connected to the grid oi said vacuum tube and means within the plate-filament circuit of said vacuum tube for-impressing a negative bias upon the grid of said power tube when current flows in the plate-filament circuit of said vacuum tube.

4. In a system for high speed transmission of signals, the combination of a power tube, a master oscillator therefor, and means for stopping the oscillations of said power tube, said means consisting of a vacuum tube having grid-filament and plate-filament circuits, means for varying the potential across said grid-filament circuit, said means consisting of a resistance, one terminal of which is connected to the filament of said vacuum tube, means for apply an alternative, positive and negative potential to the other terminal of said resistance, a variable tap connected to the grid of said vacuum tube and means within the plate-filament circuit of said vacuum tube for impressing a negative bias upon the grid of said power tube when current flows in the plate-filament circuit of said vacuum tube, said means consisting of a resistance in said plate-filament circuit connected between the source of power for said plate and the filament of said vacuum tube and a variable tap connecting said last mentioned resistance with the grid of said power tube.

EDWARD N. DING-LE1, JR. 

